Package org.apache.hadoop.mapred.lib.aggregate

Interface Summary
ValueAggregator<E> This interface defines the minimal protocol for value aggregators.
ValueAggregatorDescriptor This interface defines the contract a value aggregator descriptor must support.
 

Class Summary
DoubleValueSum This class implements a value aggregator that sums up a sequence of double values.
LongValueMax This class implements a value aggregator that maintain the maximum of a sequence of long values.
LongValueMin This class implements a value aggregator that maintain the minimum of a sequence of long values.
LongValueSum This class implements a value aggregator that sums up a sequence of long values.
StringValueMax This class implements a value aggregator that maintain the biggest of a sequence of strings.
StringValueMin This class implements a value aggregator that maintain the smallest of a sequence of strings.
UniqValueCount This class implements a value aggregator that dedupes a sequence of objects.
UserDefinedValueAggregatorDescriptor This class implements a wrapper for a user defined value aggregator descriptor.
ValueAggregatorBaseDescriptor This class implements the common functionalities of the subclasses of ValueAggregatorDescriptor class.
ValueAggregatorCombiner<K1 extends WritableComparable,V1 extends Writable> This class implements the generic combiner of Aggregate.
ValueAggregatorJob This is the main class for creating a map/reduce job using Aggregate framework.
ValueAggregatorJobBase<K1 extends WritableComparable,V1 extends Writable> This abstract class implements some common functionalities of the the generic mapper, reducer and combiner classes of Aggregate.
ValueAggregatorMapper<K1 extends WritableComparable,V1 extends Writable> This class implements the generic mapper of Aggregate.
ValueAggregatorReducer<K1 extends WritableComparable,V1 extends Writable> This class implements the generic reducer of Aggregate.
ValueHistogram This class implements a value aggregator that computes the histogram of a sequence of strings.
 



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